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Where 2803:1920:0:1::/64 is the WAN ONU, then the network connection ONU and OLT.
subnet6 2803:1920:0:1::/64 { option dhcp6.name-servers 2803:1920:0:1::1, 2001:4860:4860::8888; host test{ hardware ethernet 80:14:a8:5f:32:e4; fixed-address6 2803:1920:0:1::3; fixed-prefix6 2803:1920:0:2ff::/64; } host test2{ hardware ethernet 80:14:a8:87:d2:15; fixed-address6 2803:1920:0:1::4; fixed-prefix6 2803:1920:0:1ff::/64; } }